In a low-gravity refinery basin, a combat engineer is sent to seal contaminated vent stacks and recover core clusters from the throat.

The catalytic ash gets into seals, circuits, filters, suits, machinery, and flesh while civilians are forced to scrape it by hand under armed guard.

Comms fail, filters clog, oxygen drops, and every movement through the refinery spreads more contamination.

This is "The Heroic Liquidators" by Sascha Schmidt.